110328-02 - 6/22
ALTA
• Water Boiler
• Condensing
• Direct Vent Models
• Gas Fired
Models:
• ALTA-120
• ALTA-150
• ALTA-180
WARNING
This boiler must only be installed, serviced, or repaired by a qualified installer, service agency or gas supplier.
Improper installation, adjustment, alteration, service or maintenance can cause severe personal injury, death,
or substantial property damage. For assistance or additional information, consult a qualified installer, service
agency, or the gas supplier. Read these instructions carefully before installing.
!
Installation, Operating and Service Instructions for
Manual Contents Page
1. Installer Read Before Proceeding ...........3
2. Homeowner Read Before Proceeding ........4
3. Specifications ...........................4
4. How It Works ............................6
5. Locating Boiler ..........................8
6. Preparing Boiler ........................12
7. General Venting .........................15
8. Sidewall Direct Venting ...................22
9. Vertical Direct Venting ...................28
10. Heating System Piping ...................34
11. Gas Piping .............................41
12. Field Wiring ............................42
13. Condensate Disposal ....................45
14. Start-up and Checkout ..................46
15. Operation ..............................53
16. Before Leaving Jobsite ..................65
17. Service and Maintenance .................66
18. Troubleshooting ........................70
19. Internal Wiring Diagrams .................85
20. Service Parts ...........................88
Appendix
A. Combination Refrigeration/Heating System ..94
B. Water Quality and Boiler Additives .........95
C. Special Requirements In Massachusetts ....96
D. Code Required Text ......................98
TO THE INSTALLER:
Affix these instructions adjacent to boiler.
Provide model number and serial number when
seeking information and support.
TO THE HOMEOWNER:
Retain these instructions for future reference.
Contact heating installer or technician for all issues
and support.
Version en Español disponible en el web del fabricante. www.usboiler.net
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